20663641332 has 36 divisors (see below), whose sum is σ = 53507075076. Its totient is φ = 6719882880.

The previous prime is 20663641309. The next prime is 20663641343. The reversal of 20663641332 is 23314636602.

20663641332 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 3 + 641 + 3 + 3 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 733543056 + 19930098276 = 27084^2 + 141174^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6998403 + ... + 7001354.

It is an arithmetic number, because the mean of its divisors is an integer number (1486307641).

Almost surely, 2^20663641332 is an apocalyptic number.

It is an amenable number.

20663641332 is an abundant number, since it is smaller than the sum of its proper divisors (32843433744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20663641332 is a wasteful number, since it uses less digits than its factorization.

20663641332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13999808 (or 13999803 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

The spelling of 20663641332 in words is "twenty billion, six hundred sixty-three million, six hundred forty-one thousand, three hundred thirty-two".